1. Can You Trust Google Earth? Math and Computer Science Department Seminar Wheaton College

2. Problem: Get directions to Osseo Circle, Lincoln, NH

3. MapQuest

5. Whoops! Database problem

6. Google Maps Same problem!

7. Google Earth Dear Ol' Wheaton

8. Google Earth Something's amiss!

9. Google Maps Huh?

10. Google Earth - Terrain

11. Terrain Storage: DEM DEM = Digital Elevation Model Regular grid of elevation points

12. Creating a DEM Traditional Spot Heights Stereo Aerial Photography Automated Stereo Matching Convert to DLG Convert to DEM Manual Contouring Errors!

13. Creating a DEM Traditional Spot Heights State of the Art Stereo Aerial Photography Automated Stereo Matching Convert to DLG Convert to DEM Manual Contouring Satellite SAR Plane LiDAR Internal Representation Convert to DEM Errors!

14. DEM Error Viewer

15. Error Visualization